Vibratory screen



frb Z5 1936. E. E. DElsTl-:R lET AL Zygz VIBRATORY SCREEN Filed Feb. 16, 1935 5 Sheets-Sheet l 3 Sheeis-Shee 2 VIBRATORY SCREEN E. E, DEISTER ET AL.

Filed Feb. 16, 1935 Umd/Obey @20V/'IA TZIZEAS g, M 4%@ @AW WW Feb. 25, W36.

@ab 25, 3.936. E, E, DEISTER ET AL BLZ VIBRATORY SCREEN' Filed Febf 16, 1933 5 Shee'CS-Sheet 5 Patented Feb. 25, 1936 UETE STATES PATENT OFFICE Ind., assignors to Deister Fort Wayne, Ind.

Machine Company,

Application February 16, 1933, Serial No. 657,063

11 Claims.

This invention pertains to vibratory screens, and more particularly to a mechanism for imparting rapid tapping action to the screening medium, independent of the vibratory movement of the same.

I-Ieretofore, various means have been employed for accomplishing the foregoing, including electro-magnets, cams, weighted strips and hammers, all working directly upon the screening medium. These various devices have been found objectionable for numerous reasons, primary of which is Vexcessive cost, mutilation of the screening medium, and failure to obtain uniform tapping action over substantially the entire area of the screening medium.

The present invention has primarily for its object to overcome the foregoing objections by the provision of a novel form of striker receiving its impetus from the vibratory movement of the screen frame, and imparting a sharp tapping action to a supporting grill or lattice associated with the screening medium, to impart substantially uniform action throughout the entire area of the screening medium.

A further object resides in the provision of a striker, in which the springs and resilient arms, subject to breakage, are entirely eliminated, and which provides for a more definitely controlled action without necessitating delicate adjustment.

Incidental to the foregoing, a more specific object resides in the provision of a weighted striker, resiliently mounted at spaced points, and so designed as to produce vibratory movement, preferably in substantially a straight line at right angles to the plane of the screning medium, as a result of the orbital vibratory movement of the screen frame.

A still further object resides in the provision of a resiliently mounted vibrating grill for engagement with the screening medium, and effected by the striker to impart a sharp, controlled tapping action to the screening medium over substantially its entire area.

With the above and other objects in View, which will appear as the description proceeds, the invention resides in the novel construction, combination and arrangement of parts, substantially as hereinafter described and more particularly `,dened by the appended claims, it being understood that such changes in the precise embodiment of the herein disclosed invention may be made as come within the scope of the claims.

In the accompanying drawings is illustrated one ,complete example of the physical embodiment of the present invention constructed according to the best mode so far devised for the practical application of the principles thereof.

In the drawings:

Figure 1 is an elevation of a. screen embodying the features of the present invention.

Figure 2 is a transverse section taken on the line 2-2 of Figure 1.

Figure 3 is a detailed top plan of a striker constructed in accordance With the present invention.

Figure 4 is an end elevation of the same.

Figures 5 and 6 are elevations of the resilient bearing blocks.

Figure '7 is a bottom plan View of one of the removable screen panels, and

Figure 8 is a detailed section taken on the line 8-8 of Figure 7.

Figure 9 is a fragmentary detail of the resilient connection between one of the vibratory members and the screen frame.

As set forth in the preceding objects, the present invention is directed primarily to the striker mechanism for imparting a sharp tapping action to the screening medium during its vibratory movement, and for illustrative purposes the same is shown and will be described in connection with a specific type of resiliency mounted screen. However, it is to be understood that the invention is equally applicable to various other types of vibratory screens actuated by hammers, overbalanced pulleys, eccentrics, or other mechanical devices. Likewise, while the preferred form of the invention includes a specified type of screening medium, the same can be applied to other structures.

Referring now more particularly to the accompanying drawings, the numeral I designates a base comprising longitudinal channels 2, adapted to be supported upon a suitable foundation designed to position the frame at substantially the angle illustrated. Secured to the channels 2, adjacent their ends, are the journal housings 3, each of which comprises a casing 4 bolted or otherwise secured to the channel, and being open at its inner face, which is closed by means of a resilient disc 5 clamped to the casing 4 by a ring 6 bolted or secured to the flange of the casing in any other suitable manner.

Positioned within each of the housings 3 is a block I formed from rubber or similar resilient material, and having journaled therein the ends of the transverse tubular shaft 8, which is engaged by the resilient discs to prevent water and dirt from accumulating in the housings 3, and thus deteriorating the resilient journal blocks 1.

Supported by the transverse shafts 8 is the main vibratory frame 9, comprising longitudinal side plates ID, welded or otherwise secured to the shaftsY 8, and being suitably connected at theirupper edges by transverse angle braces II, and the usual end plates inot shown) In order to provide the desired rigidity, the transverse braces I I are welded or otherwise secured to the longitudinal angie irons I2 welded to the outer faces of the side plates'ID adjacent their upper edges. Y

In order to impart vibratory Vmovement to the main frame., a motor I3 is shown mounted upon two of the transverse braces II, while mounted on each end of the motor shaft I4 is a xed overbalanced pulley I5, which cooperates with an adjustable, over-balanced pulley I6 to control the vibratoryv movement of theV main frame, as more V,fully described and illustrated in United States Letters Patent No. 1,879,923.

Here it is to be understoodthat the'v primary vibratory movement, imparted to the main frame 9, can be accomplished -in numerous other ways without departing from the in'ventionQ4 Secured longitudinally to vthe inner i'aces of the side plates I9 are angle iron tracks I1, 'which f support the removable screen panels, designated strips faces of the'side plates Ill.

generally by the numeral IB, and comprising an 'outerxframeYV I9, consisting of angle irons secured together at their abutting ends. Secured on the lframe ZI 9 is a screening medium 2,"which in the `majority of Vcases is formed from wire mesh, al-

though in some instances perforated 'sheets may 'be employed. VIn practice the desired tension is screen 20'andthe same isthen placed'upon the by means'of strips 2I.

formed of individual` removable panelsfone or 'more of which may be employed, depending upon the size of screen desired.

v As bestv shown in Figures 2 and'?, the frame I9 is provided withspaced blocks 22 secured to the side stretches ofthe frame and engaging thelonigitudinal tracks I1 for supporting the screen frame thereon. The panels are then locked in assembled position by means of the longitudinal 23, engaging the straps 2l and the inner The strips 23 are then rdrawn into clamping engagement with the iscreen'panel and main frame by bolts 24 passing through the side plates I and engaged with the angle brackets 25.

,The foregoing is more or less conventional structure, land therefore forms'no partV of the present invention, other than in the general cornbination as hereinafter claimed, it being'understood that the salient features of the invention are equally applicable toa screen attached directly to the main vibratory frame, as well as to removable screen panels of other construction.

Considering now the striker mechanism, which is the essence of the present invention, and with particular reference to Figures 2 and 7, it will be Y noted that a housing 25 is Ysecured Yto the side ,stretches of the screen frame I9, Vcentrally of Y the panel'. 'Ihe housing 26 comprises a pair of spacedtransverse plates 21 welded or fastened to the end plates' 23'; which in turn are bolted to the side stretches of the frame I9. Y Y

The top of the housing 25 is closed by a transverse cover plate. 29 secured to the side plates 21,

and the Vend plates 28, while the bottom of the striker housing is closed by a plate 30 bolted to the angles 3l connecting the lower `edges of the side plates 21.V End partitions 32, Vsecured tc the l top plate 29, the sides 'same is locked by a set nut 45. in Figure 2, the block 44 normally rests upon a 2i, and theV angles 3 I, form ,a complete housing for the striker 33, to be hereinafter described. Y

Positioned within the housing 26, between the walls thereof, is a bearing block 34 within which a resilent bearing 35, formed of rubber'or similar material, is anchored for reception of the journal end 36 of the striker 33; The opposite'journal end; 31 of the striker is journaled in Va somewhat larger resilient block 38 held between kthe walis of the housing 26. `As will be best noted in Figure 2, the end ofthe striker 33, adjacent the journal 31 and the large resilient bearing Vblock 38, Weighted at 39, and disposed betweenthe weighted portion 39 vand the journal end 35 is a striker button 40, threaded or otherwise secured to the striker. Y

Secured to the bottom of the screening medium 28, longitudinally and centrally thereoi, is a vibrating channel strip'4l, the screening medium Ybeing clamped to the vibrating channel by a strap as will beV more fully described. The threaded stud 43 also passes through a block 44v welded Vto and forming an integral part of the vibrating channel 4L -When the screw is adjusted within the block and vibrating channel toprovide the desiredV contact with thestriker button 40the As best shown resilient washer 46, supported upon a sleeve 41, surrounding the stud and in turn supported upon the cover plate 29 of the striker housing.

Y Secured to the screening medium 20 upon opposite sides of theY vibrating channel Marethe auxiiiary vibrating channels 48, which are 'clamped to the screening medium by thestraps 49 and the bolts 50. In order to Vtransmit vibratory actionto the auxiliary strips 48 from the Astriker 33 the main vibrating channel is connected with the auxiliary strips 48 by the transverse angles Welded or secured thereto.

In ,order to provide an even distribution ofthe vibratory action of the striker thrcughout the length ofthe vibratory charme] 4I, and the auxriliary vibratory channels 48, the ends of the chan- ,nels have welded thereto split ,provided with Vtransverse resilient bushings 53 `for the reception of the stu-ds 54'carried by the Y journal boxes 52 brackets 55, which in turn are bolted to the transverse stretches of Vthe screen frame Y I9. Thus it will be seen that the screening medium is secured to'and supported upon a lattice or grill, which in turn is resiliently carried by the screen frame, thus permitting uniform and even distribution of the tapping action of the striker over substantialiy the entire area ofthe' screen, independent oi its vibratory movement imparted through the action of the main vibratory frame. While the'vibratory grillor lattice,'supporting the screening Ymedium, has a rubber or resilient connection with the screen frame, it is nevertheless sumciently rigidto be amply stable and effe'ctive in preventing whipping ofV the screening medium r From the foregoing explanation, consideredin lconnection with the accompanying drawings, it is beiieved thatthe operation ofthe present invention will be quite'apparent, in that kthe motordriven, over-balanced pulleys I5 and I6 will im-` part vibratory movement to the'main frame 9, Which is supporteddn the resilient bearings 1.

This constitutes the primary vibration, and the tapping-L action or secondaryv vibration is independently imparted to the screening medium by the striker 33, which obtains its movement and impetus through the vibratory movement of the main frame, the striker being resiliently carried by the screen frame, which in turn is securely clamped on the main vibratory frame.

I-Iere particular attention is directed to the fact that the journal ends 36 and 3'! of the striker are elliptical in cross section, their longest axis being substantially parallel to the plane of the screening medium. The purpose of this, in conjunction withother features cf the striker to be described, is to'convert theorbital movement of the main frame 9 into a substantially straight line reciprocative movement of the striker, at right angles to the screening medium.

One of the primary advantagesof the present striker mechanism resides in the elimination of springs or resilient arms, Which are subject to breakage and require frequent replacement. Further, the resilient or rubber mountings for the striker provide an exceedingly simple and inexpensive means for imparting a definitely controlled impetus'to the striker, thereby materially increasing the eifective tapping action of the hammer upon the vibratorylattice or grill, and eliminating the delicate adjustment heretofore required in` previous structures.

Due to the fact that the striker is Weighted adjacent oneend, and the striking button is positioned adjacent the opposite end, together with the fact that the light end of the striker isjournaled in a relatively small rubber bearing, while the opposite end is journaled in an enlarged'rubber block, the weighted end will have considerable moremovement than the opposite end, the movement of which is` restricted and therefore acts to a certain extent as a pivot, having a stabil izing effect on the vibratory action of the striker, particularly in instances Where an extremely short stroke, With a resultant light tapping action is desired.

The journal ends of the striker are formed elliptical in cross section, with their longest axis substantially parallel to the plane of the screening medium, While the rubber bearing blocks 35 and 38 are rectangular, being elongated in the direction of the long axis of the elliptical journal ends. While this specific structure may not be essential under varying conditions, in practice the same has been found highly effective in conjunction with the structure and type of screens illustrated, in that the elliptical shape, having its greatest axis parallel to the screening medium, presents the greatest amount of surface for the components, operating at right angles to the plane of the screening medium, to act upon. Further, the rectangular shaped rubber bearing blocks provide more material to absorb the components Working parallel to the plane of the screening medium, thus converting the primary orbital movement imparted to the main frame into a substantially straight line movement of the striker at right angles to the plane of the screening medium. In the event that a mechanism is employed for imparting primary straight line vibration to the main frame at right angles to the screening medium, instead of orbital movement, such as results from the present mechanism, then the specilc structure of the striker, and its mounting, could readily be varied. Therefore, it is to be understood that the invention in its broadest sense is not to be so limited.

In the present structure it will also be appreciated that the elliptical journal ends of the striker prevent its rotation within the bearing blocks, which is essential Where a striker button, such as illustrated and described, is employed. However, it will be quite obvious that an annular striking surface might be employed, in which instance the rotation of the striker would not be objectionable.

A still further advantage resulting from the elliptical shape of the striker ends resides in the fact that sharp corners are eliminated so that when the striker is in motion the rubber can iioW freely around the rounded surfaces of the ellipse, which also eliminates cutting and heating of the rubber.

Attention is further directed to the fact that While the striker support or housing has been illustrated and described as being carried by the removable screen panel frame, in operation the same is rigidly connected with the main frame. Therefore, it will be quite obvious that the striker support could be directly connected to the main frame without affecting its operation or depaiting from the principles of the invention.

We claim:-

1. In a. vibrating screen including a vibratory frame and a screening medium carried thereby. a striker carried by said vibratory frame and receiving its impetus from the vibratory action of said frame for imparting tapping action to said screening medium, said striker being Weighted adjacent one of its ends and provided with a striker surface adjacent its opposite end, and blocks carried by said frame and formed of resilient material for supporting the ends of said striker, and controlling its movement in a definite path relativeto the path of movement of said screening medium.

2. VIn a vibrating screen including a vibratory frame and a. screening medium carried thereby, a striker carried by said vibratory frame and receiving its impetus from the vibratory action of said frame, for imparting tapping action to said screening medium, said striker being weighted adjacent one of its ends and provided with a striker surface adjacent its opposite end, and blocks carried by said frame and formed of resilient material for supporting the ends of said striker, said resilient block adjacent the weighted end being of greater dimensions than the opposite block.

3. In a vibrating screen including a vibratory frame and a screening medium carried thereby, a striker carried by said vibratory frame and receiving its impetus from the vibratory action of said frame, for imparting tapping action to said screening medium, said striker being provided With a striker button and having journal ends elliptical in cross section, and blocks formed of resilient material for receiving said elliptical journal ends.

4. In a vibrating screen including a vibratory frame and a screening medium carried thereby, a striker carried by said vibratory frame and receiving its impetus from the vibratory action of said frame, for imparting tapping action to Said screening medium, said striker being Weighted adjacent one of its ends and provided with a striker button adjacent its opposite end, the ends of said striker being elliptical in cross section, and bearing blocks formed of resilient material for receiving the elliptical ends of said striker.

5. In a vibrating screen including a vibratory frame and a screening medium carried thereby, a striker carried by said vibratory frame and receiving its impetus from the vibratory action of Said frame, for imparting tapping action to said screening medium, said striker beingY Weighted Y adjacentV one of its ends and provided with a Y .for receiving striker button adjacent its opposite end, the ends of said striker being elliptical in cross section,

'and bearing blocks formed of resilient material the elliptical ends of said striker, said bearing block adjacent the'vveighted end of said 'striker being of greater dimension than the opposite bearing block f "6. In a vibrating screen including a vibratory frame, and a screening medium carried thereby, a plurality ofV substantially rigid connected vibratory strips secured to said screening medium, resilient connections between said vibratory strips and said frame to permitA independent movement of said Vvibratory strips, and a striker carried bythe main frame for imparting movement to said vibratory strips.

7. In a vibrating screen including a vibratoryV frame, a removable frame carried by said vibratory frame, a screening medium connected toV said removable frame,Y aV plurality of substantially rigid connected vibratory members secured to said screening medium, rubber connectionsV between said vibratory members and said removable frame, and a striker carried by said re-` movable Vframe for imparting a tapping action to said vibratory members. Y

8. In a'vibratingcscreen including a vibratory frame, a removable rameccarried by said vibratory frame, a screening medium secured to said removable frame, a plurality of spaced substantially rigid connected vibratory memberssecured to said screening medium, a housing carried Vby said removable'rframe centrally thereofpand a striker mounted in said housing for Yimparting tapping action to said vibratory members.

9.7In a vibrating screen including a vibratory Vframe, a removable frame carried by saidvibra- Y `tory frame, a screening medium'secured to said.` e

' removable frame, a plurality ofV spaced connected vibratory members secured to said screening medium, a housing Vcarried by said removable frame centrally thereof, a striker mounted in said hous- Y ing for imparting tapping action to said vibratory members, and means formed of rubber for'Y supporting said striker, and controlling its movenient in a deiinite path relative to the path of movement of said screening medium. Y Y

10. In a vibrating screen includinga vibratory frame, a removable frame carried by said vibra- Y tory frame, a screening medium secured to said Yremovable frame, a plurality of spaced connected vibratory members carried by said removableV frame and engaged with said screening medium, a Vhousing carried by said removable frame, a strikerv mounted in said housing for imparting tapping action to said vibratory members, and

means Y formed of rubber for supporting said frame centrally thereof, a striker mounted in said housing Vfer imparting tapping action toY said vibratory members, and means formed ofrrubber for supporting said striker in said housing.

EMIL E. DEISTER.

IRWIN F. DEISTER. 

